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Testo 425 Compact Thermal Anemometer

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  • Measure air flow velocity and air temperature
  • Calculate volume flow by entering duct channel area
  • Extendable telescopic probe with 820mm maximum extension

rrp £349.00

now £313.00 (Ex. VAT) £375.60 (Inc. VAT)

rrp £349.00


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  • Description

    Testo 425 Compact Thermal Anemometer

    The Testo 425 Compact Thermal Anemometer is an extremely useful instrument for use in the HVAC sector, particularly ascertaining air flow and temperature readings in ventilation ducts. This is because of the compact ø7.5mm diameter sensor that sits on top of a telescopic probe with a maximum length of 820mm. The use of a hot-wire probe rather than a vane also means that it is easier to position the meter at an appropriate angle. The anemometer had an air flow velocity range of 0 to 20m/s and a temperature range of -20˚C to 70˚C whilst volume flow can also be calculated if the user enters the cross-sectional area of the duct.

    The large, backlit, digital screen on the Testo 425 shows results for air flow, volume flow and temperature in m/s, m3/h and ˚C. It is capable of showing two readings simultaneously and also offers min/max values alongside data hold. Further measurement options include point and timed mean value calculation. The anemometer has a 20-hour battery life and is also provided with batteries and a calibration certificate.

    Testo part number: 0560 4251

    Key Features

    • Air flow velocity range: 0 to 20m/s
    • Air flow velocity accuracy: ±(0.03m/s + 5%)
    • Air flow velocity resolution: 0.01m/s
    • Temperature range: -20˚C to 70˚C
    • Temperature accuracy: ±0.5˚C
    • Temperature resolution: 0.1˚C
    • Volume flow calculation
    • 820mm telescopic probe
    • Point and timed mean values
  • Specification

    Temperature - NTC

    • Measuring range: -20 to +70 °C
    • Accuracy: ±0.5 °C (0 to +60 °C); ±0.7 °C (Remaining Range)
    • Resolution: 0.1 °C

    Velocity - Thermal anemometer

    • Measuring range: 0 to +20 m/s
    • Accuracy: ±(0.03 m/s + 5 % of mv)
    • Resolution: 0.01 m/s

    General technical data

    • Dimensions: 182 x 64 x 40 mm
    • Operating temperature: -20 to +50 °C
    • Housing: ABS
    • Battery type: 9V block battery, 6F22
    • Battery life: 20 h
    • Storage temperature: -40 to +70 °C
    • Weight: 285 g
  • Supplied Accessories

    • Testo 425 Compact Thermal Anemometer
    • Batteries
    • Calibration protocol
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    We use DPD/Interlink for all larger items and Royal Mail for smaller items and accessories. With DPD/Interlink you will receive a 1 hour delivery window on the day of delivery via e-mail/text and a notification 15 minutes before arrival so you will not have to wait around all day. You can even manage your booking online and re-arrange delivery for another date or arrange the goods to be left with a neighbour of your choice.

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    • Saturday Pre-Noon Delivery (on select products only) at £14.50*
    • Sunday Pre-Noon Delivery (on select products only) at £14.50*

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